This study sought to analyze the structural relationships between optimism, distress tolerance, grief avoidance, intrusive rumination, deliberate rumination, and psychological well-being among undergraduates who have experienced a loss.

Subjects comprised 435 university students (258 females and 177 males), with their duration of grief experience and the elapsed period from when the loss occurred having been taken into consideration.

Distress tolerance, grief avoidance, intrusive rumination, and deliberate rumination mediated the relationship between optimism and psychological well-being sequentially. Additionally, there were significant differences between the “less than 6 months” and “more than 6 months” groups in the structural relationships between optimism, distress tolerance, grief avoidance, intrusive rumination, deliberate rumination, and psychological well-being.

The direct path of grief avoidance to psychological well-being was not significant, but it was found to have a significant effect through the sequential mediations of intrusive rumination and deliberate rumination. This result suggests the need for active intervention to allow people to face and cope with life after a loss, without avoiding the loss experience.

This study examined the mediating effects of experiential avoidance on the relationship between stress and internet/smartphone addiction in adolescents.

448 middle school students completed the self-report questionnaires on school stress, home stress, multidimensional experiential avoidance, and internet/smartphone addiction.

Regression analyses and tests of indirect effects using bootstrapping showed that ‘procrastination’ and ‘distress aversion’ factors of experiential avoidance mediated the relationship between stress (school, home) and internet/smartphone addiction.

Stress increases internet/smartphone addiction through procrastination or distress aversion in adolescents. Interventions should focus not only on stress but also on experiential avoidance.

This study aimed to examine the mediating effects of mindfulness on the relationship between borderline personality trait and psychological distress.

529 female undergraduates participated to complete self-report questionnaires.

Correlational analyses showed that borderline personality trait was positively associated with psychological distress and negatively associated with mindfulness, and mindfulness was negatively related to psychological distress. Regression analyses suggested that low level of mindfulness partially mediated the relationship between borderline personality trait and psychological distress. Among mindfulness facets ‘acting with awareness,’ ‘nonjudging,’ and ‘nonreactivity’ had significant mediating effects.

Borderline personality trait affects psychological distress through low mindfulness―specifically in acting with awareness, nonjudging, or nonreactivity. This finding suggests that intervention focusing on these mindfulness facets may be helpful for those with borderline trait and psychological distress.